A fairly unstable atmosphere with plenty of sun breaks allowed updrafts to develop. One such updraft developed into a dust devil which did some damage to a storage building at the Creswell Airport.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS PQR wrote it up.
A fairly unstable atmosphere with plenty of sun breaks allowed updrafts to develop. One such updraft developed into a dust devil which did some damage to a storage building at the Creswell Airport.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Portland, OR wrote its last area forecast discussion before the first event at Sep 10, 1:52 PM PST, 1 hour 8 minutes earlier.
Area Forecast Discussion
National Weather Service Portland OR
252 PM PDT Mon Sep 10 2018
.SYNOPSIS...Cool showery weather will continue through the end of
the week as an upper level trough of low [pressure lingers over the
pacific nw. The trough weakens some and shifts slowly east over the
weekend for a trend to drier weather with temperatures closer to
normal.
&&
.SHORT TERM...TONIGHT THROUGH THURSDAY...Low level moisture and
instability in an onshore flow kept scattered showers going this
afternoon, which were tending to favor orographically favored
terrain. The loss of daytime heating and associated low level
instability will tend to reduce chances for showers tonight, but
with continued onshore flow will keep a small threat for showers
going tonight. Expect orographics to favor the coast and Coast Range.
Tue morning the models agree on swinging a shortwave across western
or as the main broad upper trough settles in over the region. the
shortwave brings better dynamics into play, increasing the threat of
showers across the region Tue morning. Several other generally weak
shortwaves along with a continuation of moist low level onshore flow
will keep chances for showers going through Thu. Cooler air in the
mid and upper levels of the atmosphere, coupled with the already
unstable low levels, will bring the potential for deeper convection
to much of the forecast area Tue afternoon and evening, and again
Wed afternoon and evening. Cool onshore flow and the upper trough
will keep temps below normal for the next few days.
.LONG TERM...Thursday night through Monday...Models generally keep
the upper trough over the region into the weekend, but differ
slightly on how quickly it moves out during the weekend. Will need
to keep a chance of showers going through Sat morning for now. As it
look like lower level flow goes northerly or offshore by Sat
afternoon in both gfs and ec, will continue to go with a dry
forecast for Sat afternoon and beyond. As heights rise Sun and Mon,
expect high temps to climb back closer to seasonal normals.
&&
.AVIATION...VFR conditions with some widely scattered showers
across the forecast area in a somewhat unstable post-frontal air
mass. Expect showers to gradually become less prominent this
evening as the air mass stabilizes a bit. This should Winds will
become light and turn southerly late tonight ahead of the next
disturbance approaching the region. Marine stratus returns to the
coast tonight, bringing lower MVFR to perhaps IFR ceilings.
Inland, expect cigs to lower to MVFR as the air mass becomes more
stable overnight. However, the next disturbance arrives on
Tuesday for another round of showers and the possibility of an
afternoon/evening thunderstorm.
KPDX AND APPROACHES...VFR this afternoon and evening, though
ceilings likely lower back to MVFR tonight. Some improvement to
low VFR likely Tuesday morning, but showers return by late
morning and a chance of a thunderstorm develops Tuesday
afternoon. Cullen
&&
.MARINE...A surface low will remain off the coast of British
Columbia. Latest buoy observations continue to trend several feet
above model guidance, holding between 9 and 11 feet over a large
portion of the coastal waters (especially north of Cascade Head).
As a result, have issued a small craft advisory for hazardous
seas for this afternoon and evening for these zones. Seas should
slowly subside over the next day or two, and trending closer to 5
or 6 feet by midweek. The low will weaken and gradually slide
south through the coastal waters Wednesday and Thursday,
maintaining generally south to southwest winds through much of
the week that remain below advisory criteria. Cullen
&&
.PQR WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
PZ...Small Craft Advisory for hazardous seas until 9 PM PDT this
evening for Coastal Waters from Cape Shoalwater WA to
Cascade Head OR out 60 NM.
Small Craft Advisory for Rough Columbia River Bar until 9 PM
PDT this evening.
Small Craft Advisory for Rough Columbia River Bar from 5 AM to
9 AM PDT Tuesday.
&&
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This discussion is for Northwest Oregon and Southwest Washington
from the Cascade crest to 60 nautical miles offshore. This area is
commonly referred to as the CWA or forecast area.The national radar mosaic for the moment the first event began.
1 dust devil. Local standard time, as filed.
A dust devil developed, hitting a storage building at the Creswell Airport. The dust devil peeled back a 20-foot section of the roof.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oregon in 2018Every state in 2018This day in weather historyWarnings in Oregon, September 2018
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 786621.